鈦酸鉀晶須增強(qiáng)鋁基復(fù)合材料的制備及性能.pdf

1、東南大學(xué)碩士學(xué)位論文鈦酸鉀晶須增強(qiáng)鋁基復(fù)合材料的制備及性能姓名：衛(wèi)中山申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：材料學(xué)指導(dǎo)教師：吳申慶2000.3.1查塑查蘭堡主蘭篁堡莖一————————————————————————————————————————————————————————一一。ABSTRACTZLl09alloyandpureA1matrixcompositesreinforcedwithpotassiumtitanatewhiskerwer

2、epreparedbyusingsqueezecastingtechniqueThemicrostructure，mechanicalproperties，thermalcyclingbehaviorfrictionandwearbehaviorofcompositeswerestudiedbytheuseofopticalmicroscope，scanningelectronmicroscope(SEM)，Xraydiffractom

3、eterandotherequipmentTheexperimentshowsthatthetensilestren掣hofK：O6rio：w／ZLl09compositesatroomtemperatureislowerthanbutathightemperatureishigherthanthatofalloymatrixTheauthoranalysesmechanicsbehaviorofcompositeswithshearl

4、agtheoryandthinkthatstressconcentrationisusuallygeneratedinsidethewhiskerundertensileloadAtroomtemperaturethetensilestrengthofcompositesisinferiortothatofalloymatrixbecausethestrengthofinterfaceistoohighandsoonAtelevated

5、temperaturetheductilityofthealloymatrixisimproved，thestressconcentrationincompositescanberelaxedthroughrecrystallizationandgrainboundaryruinationofmatrixresultingintheincreaseintensilestrengthofcompositesThetensilestreng

6、thofK：06T[O二√刖compositesishigherthanthatofmatrixbecausepureAIhasverygoodductilityThoughthecompositeshavehigherhardnessthanmatrixtheyhavegoodmachinabilityandcanbemachinedeasilywithordinarytoolsThermalexpansioncoefficiento

7、fcompositesiS10WeraboutquarterthanmatrixThermalcyclingexperimentshowsthatcompositeshavelessthermalresidualelongationandbetterdimensionalthermalstabilityUnderthecontactconditionofpin—on—disc，weartestswereconductedinditter

8、entconditionsTheresultsshowthatthecompositeshaveworsewealresistancethanalloymatrixwhichisconsideredbecausetherigidityofwhisker’SislowandwhiskerispropitioustocrackproductionandexpansionFinallybyanalyzingwornsurfaceandsubs

9、urfaceofwomspecimen，theauthorthinkthatthewearmechanismofcompositesiSdelaminationwearandabrasivewearKeywords：Potassiumtitanatewhisker，A1一matrixcomposites，Mechanicalproperties，Thermalcyclingbehavior，F(xiàn)rictionandwearproperti